An early survey of the radioactive contamination of soil due to the Fukushima Dai-ichi Nuclear Power Plant accident, with emphasis on plutonium analysis

M. Yamamoto, T. Takada, S. Nagao, T. Koike, K. Shimada, M. Hoshi, K. Zhumadilov, T. Shima, M. Fukuoka, T. Imanaka, S. Endo, A. Sakaguchi, S. Kimura

研究成果: Article査読

54 被引用数 (Scopus)

抄録

A field survey was carried out soon after the Fukushima Dai-ichi Nuclear Power Plant accident. Gamma-ray emitting radionuclides and plutonium isotopes in a series of soil samples collected from the heavily contaminated areas outside the 20-km exclusion zone, as well as from Okuma Town adjacent to the plant, were measured. Volatile radionuclides such as 131I, 134Cs, and 137Cs contributed largely to the released radioactivity. Higher depositions of these nuclides were observed in areas to the northwestern- including Okuma Town and Iitate Village, which is at a distance of 25-45 km from the plant. The results obtained were consistent with the levels and distributions estimated later by the Japan-USA joint-survey (Asahi Shimbun Company, 2011). Trace amounts of plutonium isotopes originating from the accident were detected mainly in soil samples from Iitate Village and in limited soil samples from Okuma Town. The detected levels of 239,240Pu contamination due to the accident were considered to be less than a millionth those of the 137Cs contamination.

本文言語English
ページ(範囲)341-353
ページ数13
ジャーナルGeochemical Journal
46
4
DOI
出版ステータスPublished - 2012

ASJC Scopus subject areas

  • 地球物理学
  • 地球化学および岩石学

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